Connection for iron constructions



July 22, 1930. wl 1 VAN DER KLOET ET AL 1,771,362

` CONNECTION FOB IRON CoNsTRUcTIoNs Filed Dec. 18, 41926 3 sheets-'sheet 1 July ,221, 1930- w. J. VAN DER KLoET'F-'l' AL 1,771,352

CONNCTION FOR IRON CONSTRUCTIO-NS Filed Dec. 1a, 192e s A,sums-sheet. 2

JUIY'ZZ, V1930 w'. Dfi KLOETET ALl 1,711,362' CONNECTION FOR IRON CONSTRUC'IIONS Filed Dec. 1e, 1926 :sheetssheet lif Patented July 22, 1930 stars WILLEM rOsUA un DER' NLOET AND ALEXANDER nonawi:JK` sTIrT, OF THE HAGUE, NETHERLANDS, AssIeNons To enNnnnn-jnnernnnnrne AND INVESTMENT COMPANY LIMITED, or LONDON, ENGLAND' U CONNECTION non rRON 'oONsTnUoTIoNs Application inea DecemberV 18, 192s, serial No. 155,750, and in the Netherlands Imze'mter 19, 1925.

The invention relates to a connection for iron constructions comprising metal tubes which are at both ends providedwith a flattened portion, having a bore for the passage junction-plate for making such aconnection.

ltv is already known to make iron constructions from metal tubes, which have both ends provided with a flattened portion, and which q. at each side are provided with one or more tongues or grooves and with a central bore. The junction points in constructions of this type are obtained by the interengagernent ofV the flattened ends of the tubes, meeting in one y point, by means of tongue and groove and if, plates are held together by bolts passing through the bore of the flattened ends of the tubes. If more than two tubes meet in one point, some of the plurality of meeting tubes engage each other by means of groove and tongue constructions.

The junction-plate which in accordance Vwith the invention is used-for making the above connection isprovided with at least two tongues or grooves and with at least two bores, while it may4 be provided moreover with a bent marginal portion.

By using a junction-plate according to the invention in iron constructions ofthe above type the bolts which are used for holdingV f the plates together are not only -entirely free from shearing stresses, but they are moreover almost all entirely free from unfavourable bending stresses occurring in the known constructions by reason of the fact that the tensile and compressive kforces of the tubes of a bolt and the invention also relates to aV kare maintained almost central. Thetensile Acompressive forces may be maintained entirely centrally by Venclosing the flattened ends of the tubes in the corners of a polygon betweena pairof junction plates. 1 The bolts for holding the plates together are ,thus only subjected to tension and arek entirely free from bendingV and shearing stresses. i i ,p inthe. accompanying drawings four embodiments of the invention are shown by way of example. Y 1 A ,y .i l

' Fig. l is an elevational viewlof a four tube semestre, 1 f Frig.;2is a.Cross-sectionalview. oftheright junctionfplate, .A l I Fig. similar viewofthe left junctionplate; L 1 l l f Fig. l is an elevational view of a connectionfof four'tubes in which` the main beams are not in alignment.

, Fig 5 s a section on the ,juncton-plates according to Fig. 4.

F `6 shows an elknfational` view of a con@ nectionof five tubes. f

`Fig`. 'Zis a4 section on the line VII-VII in; ing; e.,

A shows anelevational view of a connection of four tubes, the'ends of which are locatedin the cornersyof a quadrangle.

1EjFigg Sis a section on the `line IXe-IX in l'gLS. ,Y vy The flattened ends 2c of the tubes 2a and 2b arefprovided withtongues or grooves fitting into: corresponding grooves4 ,3` or around tongues a ofjfjunction-plates, 1. Through the openings in the junction-plates, axially registering withthe borein the llattenedends of the "tubes, a bolt is passed for holding the junctionplates"together. 1 In orderto :prevent predetermined tubes from turning, the junction-plates may be provided with tongues 6 fitting Ain the corresponding recesses of the flattenedV portion of the tubes. However, this turning tendency mayfalso be kprevented by giving. another the line V-#V through Y Fluo-si shape to the interengaging tongue and groove.

The junction-plates may have any desired shape in connection with their application. For a continuous connection a pair of ilat junction-plates (Figs. l, 6 and 8) may be used, while for angularly Y meeting main beams the junction-plate will have a correspondingly bent shape.

If permitted by the interstice between the junction-plates the flattened ends of aplnrality of diagonal tubes may be placed upon each other and be enclosed together between the junction-plates as shown in'Figs. 6 and 7. In heavy constructions, in which this superposing of a plurality of flattened ends is not desirable, a pair of junction-platesaccording to Figs. 8 and 9 may be used, each lattened portion being-separately enclosed `loetween the junction-plates in a corner of a polygon.

In some constructions it is advantageous to provide-the junction-plate with a 'bent-marginal portion or edge 7, whereby convenient attachment-points for angle irons 8, booms and the like areobtained'.

Byapplying the invention it is now possible to make iron constructionsof unlimited dimensions -from metal tubes whereby, without giving up strength, a saving of weight of about may be obtained.

IVe claim zl. A joint for metal building constructions comprising a` plurality of members 'having Hat ends, each iat end being formed vWitha cylindrical :boss on one-side and a corresponding cylindrical recess on the other, .the members being arranged vin a group with their ends nested together, `the boss at theend of outside respective recess and boss on said group of ends, and a supporting flat-ended member having a boss on one side of said end and a corresponding recess on the other side interftting respectively with the recess and boss constituting the other pair, on said junction plates and means to prevent relative rotation between said supporting member and said junction plates.

In testimony whereof we -aflix -oursignatures.

WILLEM JOSUA van del' KLOET. v WILLEM ALEXANDER LODEWIJK STIFT.

onemember litting into the recess at the-end of an ad-j acent member, junction plates at the sides of the group of nested ends,`on'e plate having avcylindrical recess receiving theoutside boss of said group of ends, the other having-a cylindricalboss received in the outside recess of said group, all'said bossesand recesses being coaxial and being coaXiall'y perforated for the reception of'a bolt.

2. A joint for metal building constructions, comprising a plurality of members having flat ends, each flat end being i'ormed withv a cylindrical boss on one side and a corresponding cylindricalV recess on the other, themembers being arranged in a group with .their ends nested together, the .boss at theend of on the other plate,-:one pair cooperating .with

the'nested group of ends,:therespective-boss and :recess j ofV said :pair lsinterfitting lwith the 

